System Mechanics: Mounts and Vehicles:

Briefly touched on before, mounts and other methods of transportation aid characters going from one place to another.  Beasts of burden may carry their riders, carriages or other things, as well as magical, mechanical and other forms of transportation.  Creatures that have been tamed may be used as a mount, so long as they are at least one size range larger than the character, and capable of carrying their weight.  The more easily they can, the more efficient their travels as they will run closer to their top speed when unencumbered.  Within a map of an area, a mount and its rider share the same primary square, though the mount may have more than one if large enough.  A vehicle, likewise, may have more than one square if large enough.  All movement while using a mount or vehicle is at its speed, not that of the character, nor as a sum of the speeds, but rather a reduction from that of the mount or vehicle due to the weight carried:

Mount/Vehicle Speed = Top Speed - Reductions from Carried Weight.

The cost to use a mount or vehicle varies by its type, but a simple formula exists:

Daily Rental Mount/Vehicle Cost = ((Cost to Feed/Water/Fuel + Cost to Shelter) * 1d4)) + Applicable Taxes.

If a mount or vehicle falls on a player or it crashes, the damage dealt is found thus:

Mount/Vehicle Fall/Crash Damage:  (Speed Traveling * Hardness of Impacting Object/Mount/Vehicle * Weight Differential from user or damaged party) * 1/3.